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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3eabc88fb016544c21af3a7e5f88c00b8386158bbd840570f642faece4556b' 
  AND token = 'RMeb1858KD1iq/+56xgQwXbddh6nDl9AyXv47l4dE5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}